Is it a problem that AT systems need a -5V rail (white wire), but modern ATX power supplies do not have -5V?

Unless the board is real old (like an original IBM PC or AT), it probably won't need the -5 V rail. Power supplies have not supported -5 V for some time. I bought this cable with a Coolmax A-300 P.S. to replace the original AT supply used on a 15 year old lighting control console. The -5 was not used in this instance.

where do I connect the green and black wires to?

It depends on what you are connecting this to. If its for an older at machine, they would go to the switch. These two wires are technically the power on wires. If you just connect them directly together it will come on, but they will have to stay connected for the power supply to stay on. The switch in an AT computer was a push on/ push off switch. You can use a toggle switch or even a household light switch if you just need something to turn it on and off.

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Main image of StarTech.com ATX2ATPOW ATX to AT Motherboard Power Converter Cable Female to Male

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StarTech.com ATX2ATPOW ATX to AT Motherboard Power Converter Cable Female to Male

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3 Connector Number
Multi-Color
Female to Male

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The Cable eliminates the need to source older AT style power supplies for AT motherboard systems.

Connector Number	3
Connector Detail	Connector Type(s): 1 - ATX Power (20 pin; v 1.x) Female Connector Type(s): 2 - AT Motherboard Power (2x6 pin) Male
Terminal Gender	Female to Male

StarTech.com ATX2ATPOW ATX to AT Motherboard Power Converter Cable Female to Male

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Model
Brand	StarTech.com
Model	ATX2ATPOW
Type	Power
Color	Multi-Color

Item#: N82E16812200495

StarTech.com ATX2ATPOW ATX to AT Motherboard Power Converter Cable Female to Male

Learn more about the STARTECH ATX2ATPOW

Customer Reviews of the STARTECH ATX2ATPOW

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Manufacturer Contact Info